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// Enable/disable if input length is > 0.
function checkLength(el, bId) {
if (graphit && (el.id == 'word')) return;
if(el.value.length > 0) {
enable(bId);
} else {
disable(bId);
};
};
// Enable/disable a enabled/disabled form item.
function enable(id) { $(id).removeAttr("disabled"); };
function disable(id) { $(id).attr("disabled","disabled"); };
// UI messages.
function graph_inprogress() {
$('#checkMessage').html('...');
$('#checkMessage').removeClass('success');
$('#checkMessage').removeClass('failure');
$('#word').removeClass('success');
$('#word').removeClass('failure');
$('#word').addClass('inprogress');
window.g.mover.attr({fill: '#ffff88'});
};
function graph_success() {
$('#checkMessage').html('Word accepted');
$('#checkMessage').removeClass('failure');
$('#checkMessage').addClass('success');
$('#word').removeClass('failure');
$('#word').removeClass('inprogress');
$('#word').addClass('success');
$('#checkMessage').effect("highlight", {}, 1000);
window.g.mover.attr({fill: '#cdeb8b'});
};
function graph_failure() {
$('#checkMessage').html('Word not accepted');
$('#checkMessage').removeClass('success');
$('#checkMessage').addClass('failure');
$('#word').removeClass('success');
$('#word').removeClass('inprogress');
$('#word').addClass('failure');
$('#checkMessage').effect("highlight", {}, 1000);
window.g.mover.animate({fill: '#b02b2c'}, 250);
};
// Call of RegexParser.parse() from UI.
function uiParse() {
disable('#graphit');
var parser = new RegexParser();
nfa = parser.parse($('#regex').attr('value'));
$('#parseMessage').html('Parse: '+parser.getErrorMessage());
if (parser.getErrorMessage() != 'Ok') {
$('#parseMessage').removeClass('success');
$('#parseMessage').addClass('failure');
$('#regex').addClass('failure');
} else {
$('#parseMessage').removeClass('failure');
$('#regex').removeClass('failure');
$('#parseMessage').addClass('success');
$('#regex').addClass('success');
enable('#word');
var dfa = new Nfa2Dfa(nfa);
var ttable = dfa.do();
disable('#regex');
disable('#parseButton');
if(!graphit) return;
window.g = graph();
disable('#checkButton');
};
$('#parseMessage').effect("highlight", {}, 1000);
// preparing graph movements
window.gCurrentState = g.nodes[0];
window.gPrevStates = [];
gPrevStates.push(gCurrentState);
window.inSameState = [];
window.failedInputs = [];
window.gPrevState = gCurrentState;
g.mover = g.paper.circle(
gCurrentState.node[1][0].cx.baseVal.value,
gCurrentState.node[1][0].cy.baseVal.value, 30
).attr({fill:'#ffff88', stroke: '#ccc', 'stroke-width': 4, opacity: 0.5});
graph_inprogress();
};
// Call of NfaSimulator.simulate() from UI.
function uiSimulate() {
var simulator = new NfaSimulator(nfa);
var check = simulator.simulate($('#word').attr('value'));
if (!check) {
graph_failure();
} else {
graph_success();
};
};
// Filter input.
function getKey(e, set) {
var key = String.fromCharCode(e.which);
if (e.which == 13) return true;
if (set.indexOf(key) >= 0 || e.which == 8) {
return true;
};
return false;
};
// Moving inside the graph by input symbols.
function graphMoveByInput(e) {
// no graph
if(!graphit) return;
// we are at the beginning
if (!gCurrentState || !gPrevState) {
gPrevStates.push(g.nodes[0]);
gPrevState = g.nodes[0];
gCurrentState = g.nodes[0];
};
// backspace
if (e.which == 8) {
// step over failed inputs.
if (window.failedInputs.length > 0) {
if(window.failedInputs.length == 1) {
if (ttable[gCurrentState.name].isFinal) {
graph_success();
} else {
graph_inprogress();
};
};
window.failedInputs.pop();
return;
}
// no state change
if (window.inSameState.length > 0) {
var mx = g.mover.attr('cx');
var my = g.mover.attr('cy');
var ll = g.paper.path('M'+mx+','+my+' '+mx+','+(my-25)+'Z').attr({stroke: 0});
g.mover.animateAlong(ll, 250, "bounce");
window.inSameState.pop();
if (ttable[window.gCurrentState.name].isFinal) {
graph_success();
} else {
graph_inprogress();
}
return;
}
// go back one state
window.gPrevState = gPrevStates.pop();
g.mover.animate(
{cx:gPrevState.node[1][0].cx.baseVal.value, cy:gPrevState.node[1][0].cy.baseVal.value},
750, "bounce"
);
window.gCurrentState = gPrevState;
if (ttable[window.gCurrentState.name].isFinal) {
graph_success();
} else {
graph_inprogress();
};
return;
};
// getting input
var key = String.fromCharCode(e.which);
var gNextState = g.graphNodeByName[window.ttable[window.gCurrentState.name][key]];
graph_inprogress();
// --> failure
if (!gNextState) {
window.failedInputs.push(true);
graph_failure();
return;
};
// no state change
if(gNextState.name == gCurrentState.name) {
g.mover.animateAlong(gCurrentState.node[4], 500);
window.inSameState.push(true);
return;
} else {
// state change
var theConn;
for (var c in g.connections) {
if ((window.gCurrentState.name == g.connections[c].name1) && (gNextState.name == g.connections[c].name2)) {
theConn = g.connections[c];
break;
};
};
var x = gCurrentState.node[1][0].cx.baseVal.value;
var y = gCurrentState.node[1][0].cy.baseVal.value;
line = g.paper.path(
'M'+x+gCurrentState.node[1][0].r.baseVal.value+','+y+' '+theConn.line.attr('path').toString().substring(1)
+'L'+(gNextState.node[1][0].cx.baseVal.value)+','+gNextState.node[1][0].cy.baseVal.value
).attr({stroke:'none'});
(function(g, line) {
setTimeout(function() {
g.mover.animateAlong(line, 500)
return line;
}, 1);
})(g, line);
};
window.gPrevStates.push(gCurrentState);
window.gPrevState = gCurrentState;
window.gCurrentState = gNextState;
if (ttable[window.gCurrentState.name].isFinal) {
graph_success();
};
};
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